Question 1

Checkpoints occur between the stages of the cell cycle. If a cell does not meet certain criteria at the end of a stage, it will not move to the next stage. Which of these occurs just before the cell enters the G2 stage of the cell cycle?

Accepted Answer

DNA replicates.

Answer

The nuclear membrane disintegrates
Centrioles form.
The nucleolus divides

Question 2

Meiosis produces 4 genetically different haploid cells. Mitosis produces

Accepted Answer

2 genetically identical diploid cells.

Answer

4 genetically different haploid cells.

Answer

2 genetically different diploid cells.

Answer

4 genetically identical haploid cells.

Question 3

A photo-micrograph of onion root tip cells during mitosis is shown below. Which phase of mitosis is occurring in the cell indicated by the arrow?

Accepted Answer

Anaphase

Answer

Prophase

Answer

Metaphase

Answer

Telophase

Question 4

Which of these must occur during S phase of the cell cycle so that two daughter cells can be produced during M phase?

Accepted Answer

The DNA must be replicated.

Answer

The chromosomes must be joined.

Answer

The cell membrane must be expanded.

Answer

The cytoplasm must be separated.

Question 5

The diagram shown represents the cell cycle. When cells leave the cell cycle, they exit during G1 phase and then enter G0 phase, a resting period. Most normal cells can leave G0 phase and reenter the cell cycle at G1 phase before entering S phase. Cancer cells are different because they cannot enter G0 phase and are likely to do which of the following?

Accepted Answer

Repeat the cell cycle continuously

Answer

Die after completing mitosis

Answer

Fail to complete S phase

Answer

Mutate during G1 phase

Question 6

Telophase is a stage of a cellular process that begins after the chromosomes have moved to opposite poles of the cell. During which cellular process does telophase occur?

Accepted Answer

Mitosis

Answer

Transcription

Answer

Translation

Answer

Interphase

Question 7

The model represents the change in the DNA content of a cell during the cell cycle Which part of the model represents the S phase?

Accepted Answer

II

Answer

I

Answer

III

Answer

IV

Question 8

Scientists can bioengineer skin in a laboratory to treat severe burns and other types of skin injuries. This bioengineered tissue is grown from living cells. The cellular process that enables the cells to grow and develop into tissue is —

Accepted Answer

mitosis

Answer

conjugation

Answer

budding

Answer

meiosis

Question 9

The 1918 influenza epidemic killed between 50 million and 100 million people worldwide. This epidemic happened near the end of World War I. More people died from the influenza epidemic than were killed in the war. Which of the following explains why this virus was so deadly worldwide?

Accepted Answer

All of the above

Answer

Infected soldiers returning from the war spread the virus when they coughed.

Answer

Medical personnel often became ill as a result of exposure to airborne virus particles.

Answer

Food was scarce because of the war, so people were undernourished, and their immune systems were weakened.

Question 10

As a fertilized egg divides, the cells differentiate because they —

Accepted Answer

have specific genes activated

Answer

contain a lipid bilayer

Answer

can clump together

Answer

metabolize sugars rapidly

Question 11

The diagram shows cells in different phases of mitosis. A student is trying to find a cell in a particular phase of mitosis. The student is looking for evidence that spindle fibers are separating the chromosomes to ensure that each new nucleus has one copy of each chromosome. Which cell is in the phase of mitosis that the student is searching for?

Accepted Answer

2

Answer

3

Answer

4

Answer

1

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